Backpack



FIG. 1 is a Perspective view of a backpack showing my new design;

FIG. 2 is a Front view of the backpack as shown in FIG. 1;

FIG. 3 is a Back view of the backpack as shown in FIG. 1;

FIG. 4 is a Top view of the backpack as shown in FIG. 1;

FIG. 5 is a Bottom view of the backpack as shown in FIG. 1;

FIG. 6 is a Right-side view of the backpack as shown in FIG. 1; and,

FIG. 7 is a Left-side view of the backpack as shown in FIG. 1.

The broken lines in the drawings depict portions of the backpack that form no part of the claimed design. 

CLAIM I claim the ornamental design for a backpack, as shown and described. 